Efficient, Ecofriendly, and Practical Process for the Synthesis of Quinoxalines Catalyzed by Amberlyst-15 in Aqueous Media
作者:Ju-Yan Liu、Jing Liu、Jia-Di Wang、De-Quan Jiao、Hai-Wang Liu
DOI:10.1080/00397910903219401
日期:2010.6.25
Amberlyst-15/H2O has been used as an efficient and environmentally friendly catalytic system for the synthesis of quinoxalines. The present methodology offers several advantages, such as excellent yields, short reaction time, and simple workup.
Gallium(III) triflate-catalyzed reactions of phenylene-1,2-diamines and 1,2-diketones produce quinoxalines in excellent to quantitative yields. The reactions proceed with 1 mol% catalyst in ethanol at room temperature. The catalyst can be recycled for at least 10 times. (C) 2008 Elsevier Ltd. All rights reserved.
OHTA, AKIHIRO;INOUE, MASAMI;YAMADA, JUNICHI;YAMADA, YASUHIKO;KURIHARA, TE+, J. HETEROCYCL. CHEM., 1984, 21, N 1, 103-106
YbCl3-catalyzed one-pot synthesis of dihydropyrazines, piperazines, and pyrazines
作者:Liyan Fan、Wen Chen、Changtao Qian
DOI:10.1016/j.tetlet.2012.11.005
日期:2013.1
A simple and efficient synthetic approach to dihydropyrazines via YbCl3-catalyzed reaction of α-hydroxyketones with diamines under mild conditions was developed. The corresponding 2,3-subsitituted piperazines and pyrazines were obtained through tandem conversion of dihydropyrazines with good yields.